I asked Google Gemini to tell me what part of speech in English grammar is “Son of a Bitch”. Answer:

That phrase functions as an noun phrase, specifically an interjectional epithet.
Here’s why:
* Noun Phrase: It acts like a noun, referring to a person (albeit in a highly offensive way). You could theoretically replace it with a noun in a sentence, although the meaning would be drastically different. For example, instead of saying “That son of a b**** stole my wallet!”, you could say “That thief stole my wallet!”
* Interjectional Epithet:
* Interjection: It’s often used to express strong emotion, similar to an interjection like “Wow!” or “Ouch!”
* Epithet: It’s a descriptive word or phrase added to or used instead of a person’s name, often to characterize them in some way (in this case, negatively and abusively).
So, while it’s not a single part of speech, the entire phrase operates as a noun phrase with a strong interjectory and abusive function.